nfs4: Do not remove RootInode too soon

src/add-ons/kernel/file_systems/nfs4/VnodeToInode.cpp

@@ -27,9 +27,10 @@ void
 VnodeToInode::Replace(Inode* newInode)
 {
 	WriteLocker _(fLock);
-	if (fInode != NULL)
+	if (fInode != NULL && !IsRoot()) {
 		fInode->GetFileSystem()->InoIdMap()->MarkRemoved(fID);
 		delete fInode;
+	}
 
 	fInode = newInode;
 	if (fInode != NULL) {

src/add-ons/kernel/file_systems/nfs4/VnodeToInode.h

@@ -14,6 +14,7 @@
 
 #include "Inode.h"
 #include "InodeIdMap.h"
+#include "RootInode.h"
 
 class VnodeToInode {
 public:
@@ -31,6 +32,8 @@ public:
 	inline	void		Clear();
 
 	inline	ino_t		ID() const;
+
+	inline	bool		IsRoot() const;
 private:
 			ino_t		fID;
 			rw_lock		fLock;
@@ -70,7 +73,7 @@ inline
 VnodeToInode::~VnodeToInode()
 {
 	Remove();
-	if (fFileSystem != NULL)
+	if (fFileSystem != NULL && !IsRoot())
 		fFileSystem->InoIdMap()->RemoveEntry(fID);
 	rw_lock_destroy(&fLock);
 }
@@ -101,11 +104,19 @@ inline void
 VnodeToInode::Clear()
 {
 	WriteLocker _(fLock);
+	if (!IsRoot())
 		delete fInode;
 	fInode = NULL;
 }
 
 
+inline bool
+VnodeToInode::IsRoot() const
+{
+	return fInode && fFileSystem && fInode->ID() == fFileSystem->Root()->ID();
+}
+
+
 inline Inode*
 VnodeToInode::GetPointer() const
 {